Integrated nutrient management for protected cultivation of lettuce and Chinese cabbage
Integrated nutrient management is an approach where judicious application of chemical fertilizers is used together with organic manures and biofertilizers for sustainable production. Lettuce and Chinese cabbage were studied in separate experiments under shade-house conditions with reduced levels of chemical fertilizers (50 and 75% of the recommended dosage) along with organic manures including farmyard manure (FYM) and vermicompost (VC) and biofertilizers including azotobacter and phosphorus-solubilizing bacteria (PSB) in 2015 at the Hi-Tech Horticulture Unit, University of Agricultural Sciences, Dharwad, India. Crops were raised on soil media with drip irrigation. The experiment on lettuce revealed that the treatment comprising 75% RDF + FYM and VC at 1:1 ratio equivalent to 25% recommended dose of nitrogen (RDN) + azotobacter + PSB gave significantly higher leaf yield plant-1 (300.15 g), yield ha-1 (27.00 t) and benefit:cost (B:C) ratio (3.05), which was on par with the treatment with 50% RDF + FYM and VC in 1:1 ratio equivalent to 50% RDN + azotobacter + PSB, which resulted in leaf yield of 295.35 g plant-1, 26.50 t ha-1 and B:C ratio of 3.37. Similarly, in Chinese cabbage, the treatment with application of 75% RDF + FYM and VC in 1:1 ratio equivalent to 25% RDN + azotobacter + PSB recorded significantly higher head yield per plant (1850 g), yield ha-1 (64.70 t) and B:C ratio (3.28) and it was on par with the treatment combination of 50% RDF + FYM and VC in 1:1 ratio equivalent to 50% RDN + azotobacter + PSB, which recorded a head yield of 1725 g plant-1, 60.30 t ha-1 and B:C ratio of 3.57.
Mantur, S.M., Biradar, M.S. and Dhotre, M. (2018). Integrated nutrient management for protected cultivation of lettuce and Chinese cabbage. Acta Hortic. 1227, 325-330
biofertilizers, chemical fertilizers, organic manures, shade house, yield